Advanced Materials Research Vol. 717

Abstract: Coal powder pipelines are vulnerable to abrasion, resulting in a great waste of metal materials, manpower and funds as well as serious environmental pollution, Which is a common and chronic problem in thermal power plants. After analysis of the action mechanism and performance of the anti-wear materials, this paper provides a reference for the technological transformation of thermal power plants.

Abstract: This paper proposes system level behavior model of a nonlinear power amplifier that exhibit the IMD asymmetry effect based on multisine excitation. For this work, a third order power series coefficients are originatively represented with both the system level circuit features such as a second output intercept point (OIP₂), a third output intercept point (OIP₃), amplifier gain and its excitation amplitudes. In addition, the memory effect like the asymmetry in lower and upper intermodulation products are distinguished through the analytic description and measurement. The main advantage of the proposed theory is able to analyze the composition of the nonlinear response in power amplifier. This paper also presents the measured results to validate the analytic expressions.

Abstract: In the process of unmanned aerial vehicle (uav) landing safely and quickly brake problem，Puts forward a uav electric eddy current braking method.The method through the eddy current and magnetic field interact to produce braking torque. According to the uav braking requirements, Design the uav electric eddy current brake simulation system. Test results show that: Based on the eddy current brake technology the average braking torque for 870N·m is greater than the “inner” type uav brake the average braking torque for 530N·m, Can meet the requirements of the uav braking system, So will the eddy current brake applied to unmanned aerial vehicle is feasible.

Abstract: In China, because it is difficult to pay the high electricity, resulting in a large number of highway tunnel illuminations is insufficient. In order to solve remote highway tunnel lighting power supply problem, we use the solar photovoltaic system, developed and built a solar lighting system in highway tunnel. This paper introduces the design and application process of this system.

Abstract: Based on 8-specice, 12-step finite-rate chemical reaction models, the chemical non-equilibrium flows of hydrocarbon fuel scramjet single expansion ramp nozzle (SERN) were numerical simulated. The chemical dynamic characteristics of flow in SERN were analyzed in detail. The performances of SERN were compared at various inlet static temperatures. The numerical results show that the chemical non-equilibrium effect had great influence on the performance of the nozzle at the relatively high inlet static temperature. However, influence induced by chemical non-equilibrium effect can be neglected when nozzle inlet static temperature is less than 2500K.

Abstract: It is difficult to directly determine the main cause of failure in hydraulic system on themachine tools. The transmission principle and structural characteristics of the hydraulic system mustbe fully understood before any troubleshooting start. Then the root cause of the failure can be foundand excluded through judgment and analysis on fault phenomena. This paper analyzes thecharacteristics of the hydraulic system failure, summarizes the frequently-employed methodsregarding hydraulic system failure diagnosis. The authors hope to provide some help to machinehydraulic system failure diagnosis at the workplace.

Abstract: Mechatronics is an integration technology which is the mutual penetration of mechanical technology, microelectronic technology and information technology and the inevitable development trend of electromechanical industry. This paper describes the overview, core technology and main application fields of mechatronics technology and points out its development trend.

Abstract: A general lattice Boltzmann Method (LBM) to simulate filling process of high pressure die casting (HPDC) is investigated. Boundary conditions are studied and the free surface model is established by combine the LBM with VOF method. The final model was substantiated by simulating filling process in HPDC in three dimensions. The simulated results from LBM and finite difference method (FDM) were compared with the experiments. The results show the former is in a better agreement with experiments. It demonstrates the efficiency and precision of this LBM model in describing flow pattern in filling process.

Abstract: The amplitude and phase errors deteriorate the low-sidelobe level characteristic of phased array antenna, which degrades radar performance seriously. Therefore an improved calibration method of amplitude and phase errors based on diagonal loading is proposed to address the problem of amplitude and phase errors in this paper. Initially, the mathematical models of amplitude and phase errors are developed and the impact of amplitude and phase errors is analyzed. It is found that although the interference can be suppressed when there is amplitude and phase errors in the array, the low-sidelobe level characteristic of adaptive antenna is badly deteriorated. An improved calibration method of amplitude and phase errors based on diagonal loading is proposed. Compared with traditional calibration method, proposed method can reduce the sidelobe level efficiently. At last simulations were carried out to verify the effectiveness of proposed method.

Abstract: Due to the rapid development of mobile devices, the interface requirements are more diverse, and the vibration is one of them. In this paper, implementation of local vibration on mobile devices, we propose how to implement the spatial vibration. The method being proposed tries to implement the local vibration by delivering the vibration of the vibrator to the user effectually. The local vibration was implemented through the vibration transfer ability reduction between arrangement of the vibrator and mobile apparatus and vibrator.